Jacuzzi has made numerous changes to the pump combinations in J-300 spas. The specific pumps needed dependent on the year in which your spa was built.
Pump One. Jacuzzi #6500-343 230V, 2.5HP, 2 Speed, 48 frame pump and motor combination fits all J-375 built until August 2010.
Pump Two. Jacuzzi #6500-341 230V, 2.5HP, 1 Speed, 48 frame pump and motor combination fits all J-375 built until August 2010.
These are the new universal rotation pumps, so they will fit.
If your J-375 was built after August 2010 but before Jan 2012, you'll need the 56 frame version of these pumps.
Pump One. Jacuzzi #6500-367 230V, 2.5HP, 2 Speed, 56 frame pump and motor combination.
Pump Two. Jacuzzi #6500-352, 230V, 2.5HP 1 Speed, 56 frame pump and motor combination.
If your J-375 was built in 2012 to present day, order from the following.
Pump Two. Jacuzzi #6500-352 230V, 2.5HP, 2 Speed, 56 frame pump and motor combination.
Does Not Include Power Cord.
Circulation Pump
Jacuzzi #6000-125 230V pump fits all J-375 model hot tubs built until the end of 2011. Uses 3/4" Barbed fittings.
Jacuzzi #6500-907 230V pump fits all J-375 model hot tubs built from 2012 to present day. Uses 1.5" unions.